Furuno FCV-587 Manual De Usuario

1.  OPERATION

The A-scope display shows echoes at each 
transmission with amplitudes and tone pro-
portional to their intensities, on the right 1/3 of 
the screen. The display shows strong echoes 
with strong amplitude; weak echoes in weak 
amplitude. Thus the A-scope display is useful 
for estimating the kind of school of fish and 
bottom composition.

Note: The A-scope display is only available 
with the high frequency display in dual fre-
quency operation.

1. Open the menu, select [Display] and 

press the ENTER key.

2. Select [A-Scope] and 

press the ENTER key.

3. Select the A-scope pre-

sentation type desired 
and press the ENTER key.
[Off]: Turn off the A-scope display.
[Normal]: Display shows echoes at each 
transmission with amplitudes and tone 
proportional to their intensities.
[Peak]: "Normal" A-scope display plus 
peak-hold amplitude picture for last five 
seconds in dots.

4. Press the MENU/ESC key twice to close 

the window.

With the transducer selected for other than 
600 W or 1kW (FCV-587 only), directional an-
gle range line, direction angle, directional ra-
dius, directional radius value and directional 
radius line appear on the A-scope display. 
The directional angle display provides an at-
a-glance view of the available detection 
range. In the example below an echo from a 
school of fish is at the depth of 20 m. and with-
in 8. 5 m radius of the center of the transducer 
beam.

Note: The directional angle range lines repre-
sent the transducer beamwidth. They are not 
an indication of echo strength.

Weak reflection 
(small school of 
fish or noise)

Past amplitude 
pictures are 
displayed with 
dots in [Peak] 
mode.

A-scope 
display

Reflection
from school 
of fish

Single freq. 
display

Strong 
reflection
(bottom)

AUTO_R G:AF

AUTO_R G:AF

Directional 
angle radius

Directional 
angle radius 
line

Directional 
angle range 
line

School of 
fish